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IThome · Archived at 2026-07-06 17:03

For mathematical formal proof: Mistral AI releases Leanstral 1.5, a low-cost open-source model.

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For problems in the PutnamBench math competition problem set, Leanstral 1.5 has an average solving cost of only 4 US dollars, while Seed-Prover 1.5 needs over 300 US dollars, and Aleph Prover also needs 54~68 US dollars.

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